CN106461489B - The break detection circuit of pressure-detecting device - Google Patents
The break detection circuit of pressure-detecting device Download PDFInfo
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- CN106461489B CN106461489B CN201580016381.5A CN201580016381A CN106461489B CN 106461489 B CN106461489 B CN 106461489B CN 201580016381 A CN201580016381 A CN 201580016381A CN 106461489 B CN106461489 B CN 106461489B
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- pressure
- voltage
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- detecting device
- clamp circuit
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/083—Means for indicating or recording, e.g. for remote indication electrical
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
Abstract
Break detection circuit includes: pull-up resistor (103) or pull down resistor, pull-up resistor is provided detection signal (Dd), and connect the signal line of connection wiring cable (12) (113c) with power supply (supply voltage) (Vdd), which connect by pull down resistor with GND；And voltage clamp circuit (105,105a ...), it is with high voltage clamp circuit (105au ...) and low-voltage clamp circuit (105ad ...), the high voltage clamp circuit (105au ...) is connected between signal line (113c) and power supply (Vdd), by the voltage clamping of signal line (113c) at maximum prescribed voltage (Vdm), the low-voltage clamp circuit (105ad ...) is connected between signal line (113c) and GND, by the voltage clamping of signal line (113c) at minimum prescribed voltage (Vds).
Description
Technical field
The present invention relates to the broken string inspections of the pressure-detecting device used when the pressure such as the combustion pressure of suitable detection engine
Slowdown monitoring circuit.
Background technique
Commonly known pressure-detecting device is mounted in the engine for being equipped on automobile, uses built-in piezoelectric element
The indoor pressure (combustion pressure) of (sensor element) detection burning, is usually installed on engine with construction as shown in FIG. 6.?
In Fig. 6,601 indicate the engine of automobile, and 602 indicate pressure detecting portion, and 603 indicate distribution cable, and 604 indicate control base
Plate.In this case, pressure detecting portion 602 is connect via distribution cable 603 with control base board 604, and distribution cable 603 includes
The signal wire of power supply line, GND line and transmission detection signal.The control base board 604 has according to the inspection from pressure detecting portion 602
Survey the function that signal carries out the control of engine 601.On the other hand, pressure detecting portion 602 is usually using piezo-electric crystal as inspection
Charge signal corresponding with the variable quantity of pressure obtained from the piezo-electric crystal is supplied to signal by the sensor element of measuring pressure
Processing circuit is integrated by integrating circuit, is thus transformed to voltage (detection signal) similar with pressure.
In the past, about this signal processing circuit, it is known to the signal processing of piezoelectric transducer disclosed in patent document 1
Device.Fig. 7 shows the summary of signal processing apparatus disclosed in the document 1.In Fig. 7, a terminal of sensor element 701
It is connect via capacitor 702 with the inversing input terminal of operational amplifier 703, another terminal and electricity of sensor element 701
GND (the earth) connection on road.Also, the non-inverting input terminal of operational amplifier 703 is connect with reference power supply 704, is provided
Reference voltage Vr passes through charging capacitor 705 and high impedance between the inversing input terminal and output terminal of operational amplifier 703
The parallel circuit of the discharge resistance 706 of value is connected.In addition, the signal exported from operational amplifier 703 is via operational amplifier
707 are used as signal voltage Vout to be output to outside.Fig. 8 (a) illustrates the quantity of electric charge (the charge letter obtained from sensor element 701
Number) the waveform summary of Qi, Fig. 8 (b) shows the example of the signal voltage Vout obtained from operational amplifier 707.Shown in Fig. 8 (b)
Voltage waveform be to the waveform that quantity of electric charge Qi is integrated shown in Fig. 8 (a).In addition, the substrate of signal voltage Vout
Voltage Vo (signal voltage when quantity of electric charge Qi is 0) is biased by reference power supply 704, but due in charging capacitor 705
The sedimentation phenomenon of so-called waveform and it is inconsistent with reference voltage Vr, become the voltage lower than reference voltage Vr.
However, control base board 604 above-mentioned is built in pressure detecting portion 602 according to the viewpoint for ensuring size and reliability
It is highly difficult, the indoor other places of engine are usually set to, are attached by distribution cable 603.Therefore, distribution cable
603 are often exposed in the harsh environments such as temperature or humidity, wind pressure in engine house service, engine room, and have
When external stress also generation acts on, thus when being exposed under this environment for a long time, distribution cable 603 is possible to generate broken string.
Therefore, from the viewpoint of the safety and reliability of automobile, need reliably and quickly to detect this broken string
Break detection circuit 130 as shown in Figure 9 is usually arranged in burn out detection unit.In Fig. 9,602 indicate pressure shown in Fig. 6
Test section, 604 indicate control base board shown in fig. 6, and 603 indicate distribution cable shown in fig. 6.101 become including shown in Fig. 7
Sensor element signal processing apparatus (signal processing circuit) part.Also, what 102 expression pressure detecting portions 602 had
Output amplifier, the input amplifier that 110 expression control base boards 604 have.In addition, as abnormal detection circuit 130 is constituted
Element has the pull-up resistor 103 for pulling up the output of output amplifier 102, and being arranged will be to input amplifier 110
The pull down resistor 109 that is pulled down of input.In addition, 106 and 108 respectively indicate distribution cable socket.
The power supply line 112 that includes in distribution cable 603, GND line 111, in signal wire 113 the case where either side broken string
Under, the broken string can be detected by the abnormal detection circuit 130.That is, in the case where signal wire 113 breaks, control base board 604
Input the voltage level of GND is fixed in by pull down resistor 109.Also, power supply line 112 break in the case where, not to
602 side of pressure detecting portion supplies power supply, thus the output of output amplifier 102 reaches the voltage level or high impedance of GND, control
The input of substrate 604 processed is fixed in the voltage level of GND by pull down resistor 109.In addition, the case where GND line 111 breaks
Under, the output of output amplifier 102 reaches mains voltage level or high impedance, is power supply in the output of output amplifier 102
In the case where voltage level, the input of control base board 604 is fixed in mains voltage level, in the output of output amplifier 102
In the case where being high impedance, the input of control base board 604 is fixed to by pull-up resistor 103 and pull down resistor 109 by power supply
Voltage obtained by voltage Vdd is divided.At this point, if the resistance value of pull-up resistor 103 is set to compared to pull down resistor
109 resistance value is very small, then the output voltage as detection signal becomes the fixed voltage near supply voltage Vdd.In this way,
If either side breaks in the power supply line 112, GND line 111, signal wire 113 in distribution cable 603, control base board 604
Input signal is fixed to the voltage level or mains voltage level (including neighbouring level) of GND, thus in control base board 604
Side can detect these broken strings accordingly.In addition, the output of 602 side of pressure detecting portion is set as drop-down, by control base board 604
When the input of side is set as pull-up, also can similarly it play a role.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2002-62211 bulletin
Summary of the invention
Problems to be solved by the invention
But there are as described below for the wire breakage detector (break detection circuit) of above-mentioned previous pressure-detecting device
Problem.
That is, the broken string of distribution cable 603 is to be fixed by control base board 604 according to the input signal in control base board 604
Determined in the voltage level or mains voltage level of GND, thus is possible to generate mistake judgement (error detection).
That is, even signal voltage related with the detection of pressure, the size of signal voltage are also changed according to situation, sometimes moment
Reach the voltage level of GND or the voltage of mains voltage level, thus determines whether that broken string is easy to produce according only to voltage level
Raw mistake determines (error detection), there is a problem of that reliability is poor.
On the other hand, this problem can be avoided by being combined voltage level and its by the judgement of time.
That is, being added by the way that the voltage level of GND or mains voltage level are continued setting time or more as decision condition, can be avoided
Mistake determines (error detection).But this method makes processing circuit complicate, cost increase cannot be ignored, and need
Setting time is waited, thus not can be carried out rapid judgement.In addition, if setting shorter setting time, it can be ensured that certain
Degree it is swiftness, but then from avoid mistake determine (error detection) from the viewpoint of, validity decline.
As a result, in previous break detection circuit, when detecting the broken string of distribution cable 603, from ensuring reliability
And it is still insufficient from the viewpoint of swiftness both sides, there is further room for improvement.
The object of the present invention is to provide the disconnected of the pressure-detecting device for solving the problems of this background technique
Line detection circuit.
The means used to solve the problem
In order to solve the problem above-mentioned, the break detection circuit 1 of pressure-detecting device of the invention is configured to detection detection
The broken string of distribution cable 12 in pressure-detecting device 10, the pressure-detecting device 10 at least include pressure detecting portion 11, tool
There is the pressure detecting element 101 that charge signal corresponding with the pressure is exported and receiving pressure；And the distribution cable
12, send the detection signal Dd exported from the pressure detecting portion 11 to external circuit 13, which is characterized in that the broken string inspection
Slowdown monitoring circuit includes: pull-up resistor 103 or pull down resistor, and pull-up resistor 103 is provided detection signal Dd, and will be connected to and match
The signal line 113c of line cable 12 is connect with power supply (supply voltage) Vdd, and pull down resistor connects signal line 113c and GND
It connects；And voltage clamp circuit 105 (105a ...), with high voltage clamp circuit 105au ... and low-voltage clamp circuit
105ad ..., high voltage clamp circuit 105au ... is connected between signal line 113c and power supply Vdd, by signal line 113c
Voltage clamping maximum prescribed voltage Vdm, low-voltage clamp circuit 105ad ... be connected to signal line 113c and GND it
Between, by the voltage clamping of signal line 113c in minimum prescribed voltage Vds.
In this case, according to the suitable mode of invention, connection can be set in high voltage clamp circuit 105au ...
High-pressure side resistor voltage divider circuit 30u ... between the power supply Vdd and GND of setting maximum prescribed voltage Vdm, and high electricity at this time
Pressure clamp circuit 105bu ... is able to use the pnp crystalline substance being provided from the obtained branch pressure voltage of high-pressure side resistor voltage divider circuit 40u ...
The transistor pair of body pipe 402 ... and npn transistor 401 ... particularly preferably constitutes transistor pair using complementary transistor.In addition,
High voltage clamp circuit 105au, which is also able to use, to be provided from the obtained branch pressure voltage of high-pressure side resistor voltage divider circuit 30u ...
Diode 301.On the other hand, it can be arranged in low-voltage clamp circuit 105ad ... and be connected to setting minimum prescribed voltage Vds's
Low-pressure side resistor voltage divider circuit 40d ... between power supply Vdd and GND, and low-voltage clamp circuit 105bd ... can make at this time
With the pnp transistor 405 ... and npn transistor having input from the obtained branch pressure voltage of low-pressure side resistor voltage divider circuit 40d ...
404 ... transistor pair particularly preferably constitutes transistor pair using complementary transistor.In addition, low-voltage clamp circuit 105ad
It is able to use the diode 302 being provided from the obtained branch pressure voltage of low-pressure side resistor voltage divider circuit 30d ....On the other hand, excellent
It is selected in the input side of voltage clamp circuit 105 setting and high voltage clamp circuit 105au ... and low-voltage clamp circuit 105ad ...
Signal line 113c be connected in series output resistance 104.Also, external circuit can be using output based on detection signal Dd
Control signal control base board 13, also, can be comprising the signal wire that is connect with signal line 113c in distribution cable 12
113, the power supply line 112 being connect with power supply Vdd and the GND line 111 being connect with GND.
Invention effect
Remarkable result as described below is played according to the break detection circuit 1 of such pressure-detecting device of the invention.
(1) due to having the voltage clamping with high voltage clamp circuit 105au ... He low-voltage clamp circuit 105ad ...
Circuit 105 (105a ...), thus if detection signal Dd reaches minimum prescribed voltage Vds hereinafter, can be according to from power supply Vdd
Voltage by the voltage level clamper of signal line 113c in minimum prescribed voltage Vds, and if detection signal Dd be more than most
Big assigned voltage Vdm, can make the voltage level of signal line 113c drop to GND voltage, and thus clamper in maximum prescribed
Voltage Vdm.As a result, the broken string in relation to distribution cable 12 and its peri-pheral connecting portion etc. can be reliably and quickly detected,
The higher pressure-detecting device 10 of reliability is provided, and helps to realize using more succinct structure cost effective and small-sized
Change.Therefore, particularly suitable for detecting the pressure-detecting device 10 for being equipped on the combustion pressure of engine 601 of automobile.
(2) according to preferred mode, if being connected to setting maximum prescribed electricity in high voltage clamp circuit 105au ... setting
Press the high-pressure side resistor voltage divider circuit 30u ... between the power supply Vdd and GND of Vdm, then it being capable of succinct Low-cost electric easy to use
Road sets maximum prescribed voltage Vdm.
(3) according to preferred mode, if high voltage clamp circuit 105bu ... is using being provided from high-pressure side electric resistance partial pressure
The pnp transistor 402 ... for the branch pressure voltage that circuit 40u ... is obtained and the transistor pair of npn transistor 401 ..., then can offset
The variation of emitter-to-base voltage based on temperature, it is thus possible to influence of the temperature to maximum prescribed voltage Vdm is avoided, and
And clamp current does not directly flow through high-pressure side resistor voltage divider circuit 40u ..., it is thus possible to avoid the pincers because of caused by clamp current
The variation of position voltage.
(4) according to preferred mode, if transistor pair is constituted using complementary transistor, by making each complementary transistor
Characteristic it is consistent, desired transistor pair can be easily configured.
(5) according to preferred mode, if high voltage clamp circuit 105au use is provided from high-pressure side electric resistance partial pressure electricity
The diode 301 for the branch pressure voltage that road 30u is obtained, being capable of small numbers of component composition high voltage clamp circuit easy to use
105au。
(6) according to preferred mode, if being connected to setting minimum prescribed electricity in low-voltage clamp circuit 105ad ... setting
Press the low-pressure side resistor voltage divider circuit 30d ... between the power supply Vdd and GND of Vds, then it can be easily with succinct low cost
Circuit configuration minimum prescribed voltage Vds.
(7) according to preferred mode, if low-voltage clamp circuit 105bd ... is using being provided from low-pressure side electric resistance partial pressure
The pnp transistor 405 ... for the branch pressure voltage that circuit 40d ... is obtained and the transistor pair of npn transistor 404 ..., then can offset
The variation of emitter-to-base voltage based on temperature, it is thus possible to influence of the temperature to minimum prescribed voltage Vds is avoided, and
And clamp current does not directly flow through low-pressure side resistor voltage divider circuit 40d ..., it is thus possible to avoid the pincers because of caused by clamp current
The variation of position voltage.
(8) according to preferred mode, if low-voltage clamp circuit 105ad use is provided from low-pressure side electric resistance partial pressure electricity
The diode 302 for the branch pressure voltage that road 30d is obtained can constitute low-voltage clamp circuit easily with small numbers of component
105ad。
(9) according to preferred mode, if voltage clamp circuit 105 setting with high voltage clamp circuit 105au ... and
The output resistance 104 that the signal line 113c of the input side of low-voltage clamp circuit 105ad ... is connected in series, can easily drop
The magnitude of current that low (adjustment) is needed when voltage clamp circuit 105 adjusts output voltage.
(10) according to preferred mode, if the control of control signal of the external circuit using output based on detection signal Dd
Substrate 13 then can be used as the break detection circuit 1 for being best suited for especially being mounted in the control system of the engine of automobile.
(11) according to preferred mode, if the signal wire in distribution cable 12 comprising being connect with signal line 113c
113, the power supply line 112 connecting with power supply Vdd and the GND line 111 connecting with GND, then can reliably and quickly detect this
The broken string of a little various lines 113,112 and 111.
Detailed description of the invention
Fig. 1 is the basic structure with the pressure-detecting device of break detection circuit of the preferred embodiment of the present invention
Figure.
Fig. 2 is the circuit diagram for the voltage clamp circuit that the break detection circuit has.
Fig. 3 is the signal waveforms of the action specification of the break detection circuit.
Fig. 4 is the circuit diagram of the voltage clamp circuit for the modification that the break detection circuit has.
Fig. 5 is the circuit diagram of the voltage clamp circuit for another modification that the break detection circuit has.
Fig. 6 is the synoptic diagram being mounted with for the engine for illustrating the pressure-detecting device of background technique.
Fig. 7 is the circuit diagram for the pressure detecting portion that the pressure-detecting device has.
Fig. 8 is the signal waveforms of the action specification of the pressure-detecting device.
Fig. 9 is the whole circuit diagram of the pressure-detecting device.
Label declaration
1: break detection circuit；10: pressure-detecting device；11: pressure detecting portion；12: distribution cable；13: control base board
(external circuit)；30u ...: high-pressure side resistor voltage divider circuit；30d ...: low-pressure side resistor voltage divider circuit；101: pressure detecting member
Part；103: pull-up resistor；104: output resistance；105: voltage clamp circuit；105au ... high voltage clamp circuit；105ad ... is low
Voltage clamp circuit；111:GND line；112: power supply line；113: signal wire；113c: signal line；301: diode；302: two
Pole pipe；401 ...: npn transistor；402 ...: pnp transistor；Dd detects signal；Vdd power supply (supply voltage)；Vdm: maximum rule
Constant voltage；Vds: minimum prescribed voltage.
Specific embodiment
In the following, enumerating preferred forms of the invention, and it is described in detail with reference to the accompanying drawings.
Firstly, explanation has the whole knot of the pressure-detecting device 10 of the break detection circuit 1 of present embodiment referring to Fig.1
Structure.
Pressure-detecting device 10 is substantially divided with pressure detecting portion 11, control base board 13 and connection pressure detecting portion
11 and control base board 13 distribution cable 12.Pressure detecting portion 11 has pressure detecting portion 101 and output amplifier 102, and
With the pull-up resistor 103 and voltage clamp circuit 105 for constituting break detection circuit 1.Also, distribution cable 12 includes power supply line
112, the signal wire 113 of GND line 111 and transmission output signal.In addition, 106 and 108 indicate distribution cable socket.In addition,
Control base board 13 has input amplifier 110, and has pull down resistor 109.
In this case, pressure detecting portion 101 is connect with the input side of output amplifier 102.Also, output amplifier
102 outlet side is connect with the input side of voltage clamp circuit 105, and is connect via pull-up resistor 103 with power supply Vdd.In addition,
The case where pull-up resistor 103 is connected to the leading portion of voltage clamp circuit 105 is illustrated, but also can connect in voltage clamp circuit
The leading portion of 105 back segment, that is, distribution cable socket 106.Also, the outlet side of voltage clamp circuit 105 is via distribution cable 12
In signal wire 113 connect with 13 side of control base board, the power supply line and GND line of 11 side of pressure detecting portion are via in distribution cable 12
Power supply line 112 and GND line 111 connect with 13 side of control base board.In this way, if in distribution cable 12 including and signal line
The signal wire 113 of 113c connection, the power supply line 112 connecting with power supply Vdd and the GND line 111 connecting with GND, then can
Lean on and quickly detect the broken string of these various lines 113,112 and 111.Also, control base board 13 is formed as external circuit, but such as
Fruit external circuit uses such control base board 13, then can export the control signal based on detection signal Dd, it is thus possible to structure
The break detection circuit 1 of control system as the engine for being best suited for especially being mounted in automobile.
Voltage clamp circuit 105 has the following function of describing in detail below: being minimum rule in the detection signal Dd of input
In constant voltage Vds situation below, according to the voltage from power supply Vdd by voltage level clamper in minimum prescribed voltage Vds,
In the case that the detection signal Dd of input is maximum prescribed voltage Vdm or more, by making voltage drop to GND voltage, by voltage
Clamping is illustrated later in maximum prescribed voltage Vdm, details.Also, voltage clamp circuit 105 has and letter
The output resistance 104 that number route 113c is connected in series.It is defeated that there is the output resistance 104 reduction to adjust in voltage clamp circuit 105
The function of the magnitude of current needed when voltage out.
In the following, illustrating the specific structure of the break detection circuit 1 of present embodiment referring to FIG. 1 and FIG. 2.
Break detection circuit 1 has a voltage clamp circuit 105a (105) shown in Fig. 2, specifically shown using diode
Most succinct structural example.113c indicates that signal line, outlet side are connect with signal wire 113 above-mentioned, and input side is via aforementioned
Output resistance 104 connect with the outlet side of output amplifier 102.
Voltage clamp circuit 105a has high voltage clamp circuit 105au and low-voltage clamp circuit 105ad.High voltage pincers
Position circuit 105au has the series electrical by being connected to resistance R31 and resistance R32 of the power supply (supply voltage) between Vdd and GND
The high-pressure side resistor voltage divider circuit 30u that road is constituted.If such high-pressure side resistor voltage divider circuit 30u is arranged, can be easy
Utilize succinct inexpensive circuit configuration maximum prescribed voltage Vdm.In addition, the tie point and signal of resistance R31 and resistance R32
It is connected between route 113c by diode 301.Anode-side is connect by the diode 301 with signal line 113c.As a result, will
The voltage value setting that the branch pressure voltage of resistance R31 and resistance R32 are added with the drop-out voltage forward of diode 301
For maximum prescribed voltage Vdm, if the size of the detection signal Dd of supply signal line 113c is more than the maximum prescribed voltage
Vdm, then by the voltage clamping of signal line 113c in maximum prescribed voltage Vdm.In this way, if high voltage clamp circuit
105au can then be easy benefit using the diode 301 being provided from the obtained branch pressure voltage of high-pressure side resistor voltage divider circuit 30u
High voltage clamp circuit 105au is constituted with small numbers of component.
On the other hand, low-voltage clamp circuit 105ad have by the resistance R33 that is connected between power supply Vdd and GND and
The low-pressure side resistor voltage divider circuit 30d that the series circuit of resistance R34 is constituted.If such low-pressure side resistor voltage divider circuit is arranged
30d, then succinct inexpensive circuit configuration minimum prescribed voltage Vds easy to use.In addition, the connection of resistance R33 and resistance R34
Point is connected between signal line 113c by diode 302.The diode 302 connects cathode side and signal line 113c
It connects.The electricity that the drop-out voltage forward of the branch pressure voltage of resistance R33 and resistance R34 and diode 302 will be subtracted each other as a result,
Pressure value is set as minimum prescribed voltage Vds, if the size of the detection signal Dd of supply signal line 113c reaches minimum rule
Constant voltage Vds is hereinafter, then by the voltage clamping of signal line 113c in minimum prescribed voltage Vds.In this way, if low-voltage
Clamp circuit 105ad then can using the diode 302 being provided from the obtained branch pressure voltage of low-pressure side resistor voltage divider circuit 30d
Enough small numbers of components easy to use constitute low-voltage clamp circuit 105ad.
Therefore, with signal line 113c be connected in series output resistance 104 be connected to high voltage clamp circuit 105au and
The input side of low-voltage clamp circuit 105ad.By the way that the output resistance 104 is arranged, (adjustment) can be easily reduced in voltage clamp
Position circuit 105 adjusts the magnitude of current needed when output voltage.In addition, the resistance value of output resistance 104 becomes pressure detecting portion 11
Output impedance, thus be not suitable for excessive, it is considered preferred to which the requirement of 13 side of control base board and the permissible value of the magnitude of current are set.
In the following, referring to Fig.1~Fig. 3 illustrates the movement of the break detection circuit 1 of present embodiment.In addition, pressure detecting fills
Set 10 movement on the whole it is identical as Fig. 6 above-mentioned~movement shown in Fig. 9, thus omit detailed action specification.
Fig. 3 (a) show from output amplifier 102 export detection signal Dd be more than maximum prescribed voltage Vdm when waveform,
Fig. 3 (b) shows the waveform that signal Dd is detected because of caused by the sedimentation phenomenon of waveform when becoming minimum prescribed voltage Vds or less.
In addition, horizontal axis indicates the time, the longitudinal axis indicates detection signal Dd [V].
As shown in Fig. 3 (a), the signal section Ddx more than maximum prescribed voltage Vdm is clamped at maximum prescribed voltage Vdm,
The detection signal Dd exported from pressure detecting portion 11 is the signal section being shown by a solid line.In addition, becoming most as shown in Fig. 3 (b)
Small assigned voltage Vds signal section Ddy below is clamped at minimum prescribed voltage Vds, the inspection exported from pressure detecting portion 11
Surveying signal Dd is the signal section being shown by a solid line.
In this way, the voltage waveform of the detection signal Dd exported from the pressure-detecting device 10 of present embodiment is controlled always
Between minimum prescribed voltage Vds and maximum prescribed voltage Vdm.That is, passing through from the detection signal Dd that output amplifier 102 exports
Pull-up resistor 103 is pulled to power supply line 112, and the signal of input control substrate 13 is pulled down to by pull down resistor 109
GND line 111.In the case that either side breaks in power supply line 112, GND line 111, signal wire 113 as a result, signal is detected
Dd is fixed in the voltage level of GND or the voltage of mains voltage level.
The detection signal Dd exported from the pressure-detecting device 10 of present embodiment is in the case where regular event, due to defeated
Clamp circuit 105a is in always between minimum prescribed voltage Vds and maximum prescribed voltage Vdm out, thus in distribution cable 12
The voltage level of each line be in minimum prescribed voltage Vds situation below and in the case where being more than maximum prescribed voltage Vdm,
It can only detect to produce broken string at once by the judgement based on voltage level.In addition, about pull-up, drop-down, by pressure
The drop-down of 11 side of test section in the case where pulling up 13 side of control base board, can access identical effect.
However, as previously described, in the low voltage side of detection signal Dd, basic voltage Vo is defeated as reference voltage Vr
Out, it is thus regarded that not needing low-voltage clamp circuit 105ad, but in the case where detecting the biggish situation of signal Dd, the sedimentation of waveform is existing
As increasing, thus detects signal Dd and be possible to reach minimum prescribed voltage Vds or less.Also, sensor element is sharply being applied
In the case where heating amount, the deformation of the framework due to keeping sensor element, the charge signal negative from sensor element output, inspection
Survey signal Dd is sometimes near the voltage level that moment reaches GND.In this case, if there is no low-voltage clamp circuit
105ad, even distribution cable 12 generates broken string, 13 side of control base board is also possible to carry out the judgement of mistake.Therefore, in height
It is critically important that voltage clamp circuit 105a is arranged in voltage side and low voltage side both sides.
In the following, illustrating the change of the clamp circuit 105 for the break detection circuit 1 for constituting present embodiment referring to Fig. 4 and Fig. 5
More example.
Above-mentioned voltage clamp circuit 105a shown in Fig. 3 has the advantages that small numbers of component easy to use is implemented,
But then, in the case where the drop-out voltage forward of diode 301,302 is changed due to the variation of temperature or by
In the case that voltage change sharply flows through biggish clamp current, it may have the shortcomings that clamp voltage changes.
Fig. 4 is the structural example of clamp circuit 105b, and clamp circuit 105b is electric using voltage clamping shown in Fig. 3 is eliminated
The transistor of the defect of road 105a.Voltage clamp circuit 105b has high voltage clamp circuit 105bu and low-voltage clamp circuit
105bd.High voltage clamp circuit 105bu includes high-pressure side resistor voltage divider circuit 40u, by being connected between power supply Vd and GND
Resistance R41 and R42 series circuit constitute；Transistor circuit, by the tie point and letter that are connected to resistance R41 and R42
Npn transistor 401, pnp transistor 402 and resistance R43 between number line 303 are constituted.In this case, transistor 401
Grid is connected to the tie point of resistance R41 and R42, and collector is connected to power supply Vd, and emitter is via resistance R43 and GND
Connection, and the grid of transistor 402 is connect with the emitter of transistor 401, and collector is connect with GND, emitter and
Signal wire 403 connects.As a result, the base emitter interpolar for subtracting transistor 401 from the branch pressure voltage of resistance R41 and R42
Voltage after voltage, the voltage being added with the emitter-to-base voltage of transistor 402, reach maximum prescribed voltage
Vdm.If the transistor of the complementation identical with the use of transistor 402 characteristic of transistor 401, maximum prescribed voltage Vdm and electricity
The branch pressure voltage for hindering R41 and R42 is roughly the same.
On the other hand, low-voltage clamp circuit 105bd includes low-pressure side resistor voltage divider circuit 40d, by being connected to power supply
The series circuit of resistance R45 and R46 between Vd and GND are constituted；Transistor circuit, by being connected to resistance R45's and R46
The transistor 404 of npn type between tie point and signal wire 303, the transistor 405 of pnp type and resistance R44 are constituted.This
In the case of, the grid of transistor 405 is connected to the tie point of resistance R45 and R46, and collector is connected to GND, emitter
Connect via resistance R44 with power supply Vd, and the grid of transistor 404 is connect with the emitter of transistor 405, collector with
Power supply Vd connection, emitter are connect with signal wire 403.If the complementation identical with the use of transistor 405 characteristic of transistor 404
Transistor, then minimum prescribed voltage Vds is roughly the same with the branch pressure voltage of resistance R45 and R46.
In the case where voltage clamp circuit 105b shown in Fig. 4, even the emitter-to-base voltage of transistor by
In the case that temperature changes, due to using npn transistor and pnp transistor in couples, it is thus possible to offset and be based on temperature
Emitter-to-base voltage variation.Therefore, it can be avoided temperature to maximum prescribed voltage Vdm and minimum prescribed voltage Vds
Influence, and clamp current does not directly flow through high-pressure side resistor voltage divider circuit 40u and low-pressure side resistor voltage divider circuit 40d, because
And it can be avoided the variation of the clamp voltage because of caused by clamp current.
Fig. 5 is the structural example of clamp circuit 105c, and clamp circuit 105c is shown in Fig. 3 using solving as Fig. 4
The transistor of the shortcomings that voltage clamp circuit 105a, Fig. 5 are shown relative to the less structural example of Fig. 4 part count.In addition,
503 expression outlet sides connect with signal wire 113 above-mentioned, the signal wire that input side is connect with output resistance 104 above-mentioned.It should
Voltage clamp circuit 105c has high voltage clamp circuit 105cu and low-voltage clamp circuit 105cd.High voltage clamp circuit
105cu has the transistor electricity being made of the transistor 501 of npn type, the transistor 502 of pnp type and resistance R51 and resistance R52
Road.In this case, the grid of transistor 501 and collector are connect via resistance R51 with power supply Vd, the hair of transistor 501
Emitter-base bandgap grading is connect via resistance R52 with GND.Also, the grid of transistor 502 is connect with the emitter of transistor 501, transistor
502 collector is connect with GND, and the emitter of transistor 502 is connect with signal wire 503.In this case, resistance R51 and
Resistance R52 constitutes high-pressure side resistor voltage divider circuit 50u.
The clamp voltage of high voltage clamp circuit 105cu is indicated with following [numerical expression 1].Wherein, Vd indicates supply voltage,
Vnpn indicates that the forward voltage of npn transistor 501, Vpnp indicate the forward voltage of pnp transistor 502, and R1, R2 are respectively indicated
The resistance value of resistance R51, R52.
[numerical expression 1] (Vd-Vnpn) × R2/ (R1+R2)+Vpnp
On the other hand, low-voltage clamp circuit 105cd has by npn transistor 505, pnp transistor 504 and resistance R53
The transistor circuit constituted with resistance R54.In this case, the grid of transistor 504 and collector via resistance R54 with
The emitter of GND connection, transistor 504 is connect via resistance R53 with power supply Vd.Also, the grid and transistor of transistor 505
504 emitter connection, the collector of transistor 505 are connect with power supply Vd, and the emitter and signal wire 503 of transistor 505 connect
It connects.In this case, resistance R53 and resistance R54 constitutes low-pressure side resistor voltage divider circuit 50d.
The clamp voltage of low-voltage clamp circuit 105cd is indicated with following [numerical expression 2].Wherein, Vd indicates supply voltage,
Vnpn indicates that the forward voltage of npn transistor 505, Vpnp indicate the forward voltage of pnp transistor 504, and R3, R4 are respectively indicated
The resistance value of resistance R53, R54.
[numerical expression 2] (Vd-Vpnp) × R3/ (R3+R4)+Vnpn
The voltage clamp circuit 105b of Fig. 4 above-mentioned is under the steady state acted without clamper, in npn transistor
Electric current is flowed through in 401 base stage and the two systems that drain, and the voltage clamp circuit 105c of Fig. 5 is respectively only in a system
In flow through electric current, thus also have the advantages that power consumption can be further suppressed.
Preferred forms are described in detail above, but the present invention is not limited to such embodiments, about thin
Structure, shape, material, quantity, the method etc. for saving part, can carry out any change without departing from the scope of spirit of the present invention
More, additional, deletion.
For example, the company that can be connected using other means displacements such as the circuit for reducing (adjustment) magnitude of current with signal line 113c
The output resistance 104 connect.Also, show the control base board of control signal of the external circuit using output based on detection signal Dd
13 the case where, but can also be using the various other signal processing circuits etc. that can utilize detection signal Dd.It is preferred that in wiring line
Include signal wire 113, the power supply line 112 being connect with power supply Vdd and the GND line 111 being connect with GND in cable 12, but also can wrap
Containing other lines, using a part for the case member for constituting engine room, GND line 111 is not necessarily required to wrap
It is contained in distribution cable 12.Showing high voltage clamp circuit 105bu ... and low-voltage clamp circuit 105bd ... both sides is to have
The structure of the transistor pair of pnp transistor 402 ... and npn transistor 401 ..., but only high voltage clamp circuit is not precluded
105bu ... and low-voltage clamp circuit 105bd a ... side are that have pnp transistor 402 ... and the crystal of npn transistor 401 ...
The structure of pipe pair, the case where another party is set as other circuit structures.Equally, show high voltage clamp circuit 105au and
The case where low-voltage clamp circuit 105ad both sides are constituted using diode 301, but only high voltage clamp circuit is not precluded
The case where 105au and mono- side of low-voltage clamp circuit 105ad are constituted using diode 301.Additionally, it is preferred that using complementary transistor
Pipe constitutes transistor pair, but the case where using other types of transistor is not precluded.
Industrial availability
Break detection circuit of the invention can be widely applied for detect the pressure-detecting device of the combustion pressure of engine
The detection of the broken string of pressure-detecting device for representative, with same structure.
Claims (12)
1. a kind of break detection circuit of pressure-detecting device, for detecting the broken string of the distribution cable in pressure-detecting device,
The pressure-detecting device at least includes pressure detecting portion, has and exports charge corresponding with the pressure and receiving pressure
The pressure detecting element of signal；And the distribution cable, the detection signal exported from the pressure detecting portion is sent to outer
Portion's circuit, which is characterized in that the break detection circuit includes:
Pull-up resistor or pull down resistor, the pull-up resistor are provided the detection signal, and will be connected to the wiring line
The signal line of cable connects to power supply, which connect by the pull down resistor with GND；And
Voltage clamp circuit, with high voltage clamp circuit, low-voltage clamp circuit and output resistance, the high voltage clamper
Circuit connection is between the signal line and power supply, and by the voltage clamping of the signal line in maximum prescribed voltage, this is low
Voltage clamp circuit is connected between the signal line and GND, by the voltage clamping of the signal line in minimum prescribed electricity
The signal line of the input side of pressure, the output resistance and the high voltage clamp circuit and the low-voltage clamp circuit
It is connected in series.
2. the break detection circuit of pressure-detecting device according to claim 1, which is characterized in that
The high voltage clamp circuit has high-pressure side resistor voltage divider circuit, which is connected to setting institute
It states between the power supply of maximum prescribed voltage and GND.
3. the break detection circuit of pressure-detecting device according to claim 2, which is characterized in that
The high voltage clamp circuit has used the pnp for being provided the branch pressure voltage obtained from the high-pressure side resistor voltage divider circuit
The transistor pair of transistor and npn transistor.
4. the break detection circuit of pressure-detecting device according to claim 3, which is characterized in that
The transistor is constituted to using complementary transistor.
5. the break detection circuit of pressure-detecting device according to claim 2, which is characterized in that
The high voltage clamp circuit, which has used, is provided the two of the branch pressure voltage obtained from the high-pressure side resistor voltage divider circuit
Pole pipe.
6. the break detection circuit of pressure-detecting device according to claim 1, which is characterized in that
The low-voltage clamp circuit has low-pressure side resistor voltage divider circuit, which is connected to setting institute
It states between the power supply of minimum prescribed voltage and GND.
7. the break detection circuit of pressure-detecting device according to claim 6, which is characterized in that
The low-voltage clamp circuit has used the pnp for being entered the branch pressure voltage obtained from the low-pressure side resistor voltage divider circuit
The transistor pair of transistor and npn transistor.
8. the break detection circuit of pressure-detecting device according to claim 7, which is characterized in that
The transistor is constituted to using complementary transistor.
9. the break detection circuit of pressure-detecting device according to claim 6, which is characterized in that
The low-voltage clamp circuit, which has used, is provided the two of the branch pressure voltage obtained from the low-pressure side resistor voltage divider circuit
Pole pipe.
10. the break detection circuit of pressure-detecting device according to claim 1, which is characterized in that
The external circuit is the control base board for exporting the control signal based on the detection signal.
11. the break detection circuit of pressure-detecting device according to claim 1, which is characterized in that
The distribution cable includes the signal wire connecting with the signal line, the power supply line connecting with the power supply, Yi Jiyu
The GND line of the GND connection.
12. the break detection circuit of pressure-detecting device according to claim 1, which is characterized in that
The break detection circuit is applied to detect the pressure-detecting device of the combustion pressure for the engine for being equipped on automobile.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-067067 | 2014-03-27 | ||
| JP2014067067 | 2014-03-27 | ||
| PCT/JP2015/059138 WO2015147062A1 (en) | 2014-03-27 | 2015-03-25 | Disconnection sensing circuit for pressure detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106461489A CN106461489A (en) | 2017-02-22 |
| CN106461489B true CN106461489B (en) | 2019-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580016381.5A Active CN106461489B (en) | 2014-03-27 | 2015-03-25 | The break detection circuit of pressure-detecting device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10247634B2 (en) |
| EP (1) | EP3124939B1 (en) |
| JP (1) | JP6605450B2 (en) |
| CN (1) | CN106461489B (en) |
| WO (1) | WO2015147062A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018160764A (en) * | 2017-03-22 | 2018-10-11 | アイシン精機株式会社 | Signal transmission circuit |
| JP2021018075A (en) * | 2019-07-17 | 2021-02-15 | 株式会社デンソー | Sensor device |
| US11585716B2 (en) * | 2020-03-03 | 2023-02-21 | J. Brasch Co., Llc | Pad presence sensing system |
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- 2015-03-25 US US15/129,713 patent/US10247634B2/en active Active
- 2015-03-25 EP EP15768972.0A patent/EP3124939B1/en active Active
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| JPH05321747A (en) * | 1992-05-20 | 1993-12-07 | Toyota Motor Corp | Abnormality judging device of combustion pressure sensor |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3124939A1 (en) | 2017-02-01 |
| JP6605450B2 (en) | 2019-11-13 |
| WO2015147062A1 (en) | 2015-10-01 |
| JPWO2015147062A1 (en) | 2017-04-13 |
| EP3124939B1 (en) | 2018-11-07 |
| EP3124939A4 (en) | 2017-11-01 |
| US10247634B2 (en) | 2019-04-02 |
| CN106461489A (en) | 2017-02-22 |
| US20170138810A1 (en) | 2017-05-18 |
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